/*
 * Copyright (C) 2012 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Predicate;

import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.CheckForNull;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Implementation of {@link Multimaps#filterKeys(SetMultimap, Predicate)}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
final class FilteredKeySetMultimap<K extends @Nullable Object, V extends @Nullable Object>
        extends FilteredKeyMultimap<K, V> implements FilteredSetMultimap<K, V>
{

    FilteredKeySetMultimap(SetMultimap<K, V> unfiltered, Predicate<? super K> keyPredicate)
    {
        super(unfiltered, keyPredicate);
    }

    @Override
    public SetMultimap<K, V> unfiltered()
    {
        return (SetMultimap<K, V>) unfiltered;
    }

    @Override
    public Set<V> get(@ParametricNullness K key)
    {
        return (Set<V>) super.get(key);
    }

    @Override
    public Set<V> removeAll(@CheckForNull Object key)
    {
        return (Set<V>) super.removeAll(key);
    }

    @Override
    public Set<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values)
    {
        return (Set<V>) super.replaceValues(key, values);
    }

    @Override
    public Set<Entry<K, V>> entries()
    {
        return (Set<Entry<K, V>>) super.entries();
    }

    @Override
    Set<Entry<K, V>> createEntries()
    {
        return new EntrySet();
    }

    class EntrySet extends Entries implements Set<Entry<K, V>>
    {
        @Override
        public int hashCode()
        {
            return Sets.hashCodeImpl(this);
        }

        @Override
        public boolean equals(@CheckForNull Object o)
        {
            return Sets.equalsImpl(this, o);
        }
    }
}
